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Accrued Loss Reserves (Detail) - USD ($) $ in Thousands | May 31, 2018 | May 31, 2017
--- | --- | ---
Schedule of Accrued Liabilities [Line Items] |  |
Accrued losses | $ 22,132 | $ 31,735
Accrued Loss Reserves - Noncurrent | 37,106 | 33,417
Accrued product liability reserves |  |
Schedule of Accrued Liabilities [Line Items] |  |
Accrued losses | 12,900 | 14,932
Accrued Loss Reserves - Noncurrent | 29,902 | 28,222
Accrued warranty reserves |  |
Schedule of Accrued Liabilities [Line Items] |  |
Accrued losses | 8,088 | 15,701
Accrued Loss Reserves - Noncurrent | 3,633 | 3,448
Accrued environmental reserves |  |
Schedule of Accrued Liabilities [Line Items] |  |
Accrued losses | 1,144 | 1,102
Accrued Loss Reserves - Noncurrent | $ 3,571 | $ 1,747

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